Ever wondered how your email can cross the vastness of the ocean and be delivered almost instantly, anywhere in the world? It's all down to a network of fibre-optic cables that link up the continents and transmit terabits of data every second.

Thanks to TeleGeography, a US telecommunications research firm, you can now view these submarine cables on an interactive map and get a sense of the physical infrastructure that keeps the internet going.

The map shows 188 active and planned submarine cables, along with their landing points. Clicking a cable gives you more information, such as its name, its length, who owns it and where it meets land. Clicking a landing point will also tell you which cables terminate at that location.